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Step down test - assessment of postural stability in patients with chronic ankle instability


Bolt, Doris; Giger, René; Wirth, Stefan; Swanenburg, Jaap (2018). Step down test - assessment of postural stability in patients with chronic ankle instability. Journal of sport rehabilitation, 27(1):online.

Abstract

Context: The underlying mechanism in 27% of ankle sprains is a fall while navigating stairs. Therefore, the step-down test (SDT) may be useful to investigate dynamic postural stability deficits in individuals with chronic ankle instability (CAI). Objective: To investigate the test–retest reliability and validity of the forward and lateral SDT protocol between individuals with CAI and uninjured controls. Design: Test–retest study. Setting: University hospital. Participants: A total of 46 individuals, 23 with CAI and 23 uninjured controls. Main Outcome Measures: Time to stabilization of the forward and lateral SDT. Results: The absolute reliability (SEM = 0.04–0.12 s; SDD = 0.11–0.33 s) of the SDT protocol was acceptable, whereas the relative reliability (ICC3, k = 0.12–0.63) and discriminant validity (P = .42–.99; AUC = 0.50–0.57) were not. Conclusions: The SDT appears to not be challenging enough to detect dynamic postural stability differences between individuals with and without CAI. However, the SDT may be capable of measuring change over time based on its good absolute reliability.

Abstract

Context: The underlying mechanism in 27% of ankle sprains is a fall while navigating stairs. Therefore, the step-down test (SDT) may be useful to investigate dynamic postural stability deficits in individuals with chronic ankle instability (CAI). Objective: To investigate the test–retest reliability and validity of the forward and lateral SDT protocol between individuals with CAI and uninjured controls. Design: Test–retest study. Setting: University hospital. Participants: A total of 46 individuals, 23 with CAI and 23 uninjured controls. Main Outcome Measures: Time to stabilization of the forward and lateral SDT. Results: The absolute reliability (SEM = 0.04–0.12 s; SDD = 0.11–0.33 s) of the SDT protocol was acceptable, whereas the relative reliability (ICC3, k = 0.12–0.63) and discriminant validity (P = .42–.99; AUC = 0.50–0.57) were not. Conclusions: The SDT appears to not be challenging enough to detect dynamic postural stability differences between individuals with and without CAI. However, the SDT may be capable of measuring change over time based on its good absolute reliability.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Balgrist University Hospital, Swiss Spinal Cord Injury Center
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2018
Deposited On:10 Oct 2017 13:20
Last Modified:01 Mar 2018 16:01
Publisher:Human Kinetics
ISSN:1056-6716
OA Status:Closed
Publisher DOI:https://doi.org/10.1123/jsr.2017-0074
PubMed ID:28787236

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